Microtubules are hollow polymers made up of tubulin subunits. Neurons, like other eukaryotic cells, contain a pool of free tubulin subunits and a pool of the microtubule polymers. These two pools dynamically exchange with one another such that microtubules undergo bouts of assembly and disassembly.n neurons, microtubules are also nucleated at the centrosome (located in the cell body of the neuron), but the microtubules are then severed from the centrosome so that they can be deployed into axons and dendrites.
If the parent makes this election, the child does not have to file a return. Earned and Unearned Income. If a child has both earned and unearned income, he or she must file a return (2016 and 2015) if: unearned income was over $1,050; earned income was over $6,300, or
Different rules apply if someone can claim you as a dependent on his tax return. You can't claim an exemption for yourself if you're a dependent, so you're limited to the amount of the standard deduction. You must file a return and pay taxes on income that exceeds $6,200 in 2014 and $6,300 for the 2015 tax year. This rule only addresses earned income, however. If you have unearned income, such as income from interest or investments, speak with a tax professional about the different rules that apply. Tax Breaks for Seniors